I'm almost done with the parts on partitions, permutations, tableaux, skew tableaux, and tabloids.
On 2/24/07, Robert Miller <[EMAIL PROTECTED]> wrote: > > Maybe something for partitions too... I'm working on stuff that's all > partitions and permutations, and SAGE doesn't seem to speak fluently > in this area yet. > > On Feb 23, 3:02 pm, "Nick Alexander" <[EMAIL PROTECTED]> wrote: > > On Feb 23, 1:01 pm, "William Stein" <[EMAIL PROTECTED]> wrote: > > > > > > > > > On 2/23/07, Mike Hansen <[EMAIL PROTECTED]> wrote: > > > > > > The last couple days I've been working on adding a fair amount of > > > > functionality to the combinat module of SAGE. Mostly, I'd like to get > > > > it roughly as feature-complete as mupad-combinat or combinatorica. > > > > > Excellent! Also look at the combinatorics functionality in MAGMA and > > > Maple... > > > > > > I was wondering the best way to go about integrating these changes > > > > into SAGE, specifically naming conventions. For example, there are > > > > about 75 functions that apply to permuations of the form [1,2,3]. > > > > Right now, I just have them in permutation.py in combinat/ and am > > > > importing them all through all.py. Would it be better / more > > > > consistent to just have all.py import permuation and then call the > > > > routines through something like permutation.descents(p) ? > > > > > Yes, that would help a lot to not pollute the global namespace > > > too much. Alternatively, all functions on permutations could > > > be methods on PermutationGroupElements, which are defined > > > in sage/groups/perm_gps/. This would be a nice way of unifying > > > things a bit more, and would make a lot of sense. > > > > This makes a lot of sense for things like permutation.order(), > > permutation.descents(), etc, but not a lot of sense for "number of > > permutations with no three ascents" or similar. Those should be > > methods in PermutationGroup. > > > > But in general, I second the "methods in class hierarchy" layout. > > It's working well for EllipticCurves. > > > > Thanks, Mike, for implementing much needed functionality! > > > > Nick > > > > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~----------~----~----~----~------~----~------~--~---
